{"id":351,"date":"2015-04-18T20:32:19","date_gmt":"2015-04-18T12:32:19","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=351"},"modified":"2015-04-18T20:41:46","modified_gmt":"2015-04-18T12:41:46","slug":"115%e4%b8%aajava%e9%9d%a2%e8%af%95%e9%a2%98%e5%92%8c%e7%ad%94%e6%a1%88-%e7%bb%88%e6%9e%81%e5%88%97%e8%a1%a8%ef%bc%88%e4%b8%8a%ef%bc%89","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=351","title":{"rendered":"115\u4e2aJava\u9762\u8bd5\u9898\u548c\u7b54\u6848\u2014\u2014\u7ec8\u6781\u5217\u8868\uff08\u4e0a\uff09"},"content":{"rendered":"<div class=\"copyright-area\">\u672c\u6587\u6211\u4eec\u5c06\u8981\u8ba8\u8bbaJava\u9762\u8bd5\u4e2d\u7684\u5404\u79cd\u4e0d\u540c\u7c7b\u578b\u7684\u9762\u8bd5\u9898\uff0c\u5b83\u4eec\u53ef\u4ee5\u8ba9\u96c7\u4e3b\u6d4b\u8bd5\u5e94\u8058\u8005\u7684Java\u548c\u901a\u7528\u7684\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u80fd\u529b\u3002\u4e0b\u9762\u7684\u7ae0\u8282\u5206\u4e3a\u4e0a\u4e0b\u4e24\u7bc7\uff0c<a href=\"http:\/\/www.importnew.com\/10980.html\">\u7b2c\u4e00\u7bc7<\/a>\u5c06\u8981\u8ba8\u8bba\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u548c\u5b83\u7684\u7279\u70b9\uff0c\u5173\u4e8eJava\u548c\u5b83\u7684\u529f\u80fd\u7684\u5e38\u89c1\u95ee\u9898\uff0cJava\u7684\u96c6\u5408\u7c7b\uff0c\u5783\u573e\u6536\u96c6\u5668\uff0c<a href=\"http:\/\/www.importnew.com\/11028.html\">\u7b2c\u4e8c\u7bc7<\/a>\u4e3b\u8981\u8ba8\u8bba\u5f02\u5e38\u5904\u7406\uff0cJava\u5c0f\u5e94\u7528\u7a0b\u5e8f\uff0cSwing\uff0cJDBC\uff0c\u8fdc\u7a0b\u65b9\u6cd5\u8c03\u7528(RMI)\uff0cServlet\u548cJSP\u3002<\/div>\n<p><!--more--><\/p>\n<p>\u5f00\u59cb\uff01<\/p>\n<p>\u76ee\u5f55<\/p>\n<p><a title=\"115\u4e2aJava\u9762\u8bd5\u9898\u548c\u7b54\u6848\u2014\u2014\u7ec8\u6781\u5217\u8868\uff08\u4e0a\uff09\" href=\"https:\/\/ai.zhousir.top\/?p=351#oop\">\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\uff08OOP\uff09<\/a><\/p>\n<p><a href=\"https:\/\/ai.zhousir.top\/?p=351#general\">\u5e38\u89c1\u7684Java\u95ee\u9898<\/a><\/p>\n<p><a href=\"https:\/\/ai.zhousir.top\/?p=351#thread\">Java\u7ebf\u7a0b<\/a><\/p>\n<p><a href=\"https:\/\/ai.zhousir.top\/?p=351#collection\">Java\u96c6\u5408\u7c7b<\/a><\/p>\n<p><a href=\"https:\/\/ai.zhousir.top\/?p=351#gc\">\u5783\u573e\u6536\u96c6\u5668<\/a><\/p>\n<p><span id=\"oop\">\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\uff08OOP\uff09<\/span><\/p>\n<p>Java\u662f\u4e00\u4e2a\u652f\u6301\u5e76\u53d1\u3001\u57fa\u4e8e\u7c7b\u548c\u9762\u5411\u5bf9\u8c61\u7684\u8ba1\u7b97\u673a\u7f16\u7a0b\u8bed\u8a00\u3002\u4e0b\u9762\u5217\u51fa\u4e86\u9762\u5411\u5bf9\u8c61\u8f6f\u4ef6\u5f00\u53d1\u7684\u4f18\u70b9\uff1a<\/p>\n<ul>\n<li>\u4ee3\u7801\u5f00\u53d1\u6a21\u5757\u5316\uff0c\u66f4\u6613\u7ef4\u62a4\u548c\u4fee\u6539\u3002<\/li>\n<li>\u4ee3\u7801\u590d\u7528\u3002<\/li>\n<li>\u589e\u5f3a\u4ee3\u7801\u7684\u53ef\u9760\u6027\u548c\u7075\u6d3b\u6027\u3002<\/li>\n<li>\u589e\u52a0\u4ee3\u7801\u7684\u53ef\u7406\u89e3\u6027\u3002<\/li>\n<\/ul>\n<p>\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u6709\u5f88\u591a\u91cd\u8981\u7684\u7279\u6027\uff0c\u6bd4\u5982\uff1a\u5c01\u88c5\uff0c\u7ee7\u627f\uff0c\u591a\u6001\u548c\u62bd\u8c61\u3002\u4e0b\u9762\u7684\u7ae0\u8282\u6211\u4eec\u4f1a\u9010\u4e2a\u5206\u6790\u8fd9\u4e9b\u7279\u6027\u3002<\/p>\n<p>\u5c01\u88c5<\/p>\n<p>\u5c01\u88c5\u7ed9\u5bf9\u8c61\u63d0\u4f9b\u4e86\u9690\u85cf\u5185\u90e8\u7279\u6027\u548c\u884c\u4e3a\u7684\u80fd\u529b\u3002\u5bf9\u8c61\u63d0\u4f9b\u4e00\u4e9b\u80fd\u88ab\u5176\u4ed6\u5bf9\u8c61\u8bbf\u95ee\u7684\u65b9\u6cd5\u6765\u6539\u53d8\u5b83\u5185\u90e8\u7684\u6570\u636e\u3002\u5728Java\u5f53\u4e2d\uff0c\u67093\u79cd\u4fee\u9970\u7b26\uff1apublic\uff0cprivate\u548cprotected\u3002\u6bcf\u4e00\u79cd\u4fee\u9970\u7b26\u7ed9\u5176\u4ed6\u7684\u4f4d\u4e8e\u540c\u4e00\u4e2a\u5305\u6216\u8005\u4e0d\u540c\u5305\u4e0b\u9762\u5bf9\u8c61\u8d4b\u4e88\u4e86\u4e0d\u540c\u7684\u8bbf\u95ee\u6743\u9650\u3002<\/p>\n<p>\u4e0b\u9762\u5217\u51fa\u4e86\u4f7f\u7528\u5c01\u88c5\u7684\u4e00\u4e9b\u597d\u5904\uff1a<\/p>\n<ul>\n<li>\u901a\u8fc7\u9690\u85cf\u5bf9\u8c61\u7684\u5c5e\u6027\u6765\u4fdd\u62a4\u5bf9\u8c61\u5185\u90e8\u7684\u72b6\u6001\u3002<\/li>\n<li>\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u7528\u6027\u548c\u53ef\u7ef4\u62a4\u6027\uff0c\u56e0\u4e3a\u5bf9\u8c61\u7684\u884c\u4e3a\u53ef\u4ee5\u88ab\u5355\u72ec\u7684\u6539\u53d8\u6216\u8005\u662f\u6269\u5c55\u3002<\/li>\n<li>\u7981\u6b62\u5bf9\u8c61\u4e4b\u95f4\u7684\u4e0d\u826f\u4ea4\u4e92\u63d0\u9ad8\u6a21\u5757\u5316\u3002<\/li>\n<\/ul>\n<p>\u53c2\u8003<a class=\"external\" href=\"http:\/\/examples.javacodegeeks.com\/java-basics\/encapsulation-in-java\/\" target=\"_blank\" rel=\"nofollow\">\u8fd9\u4e2a\u6587\u6863<\/a>\u83b7\u53d6\u66f4\u591a\u5173\u4e8e\u5c01\u88c5\u7684\u7ec6\u8282\u548c\u793a\u4f8b\u3002<\/p>\n<p>\u591a\u6001<\/p>\n<p>\u591a\u6001\u662f\u7f16\u7a0b\u8bed\u8a00\u7ed9\u4e0d\u540c\u7684\u5e95\u5c42\u6570\u636e\u7c7b\u578b\u505a\u76f8\u540c\u7684\u63a5\u53e3\u5c55\u793a\u7684\u4e00\u79cd\u80fd\u529b\u3002\u4e00\u4e2a\u591a\u6001\u7c7b\u578b\u4e0a\u7684\u64cd\u4f5c\u53ef\u4ee5\u5e94\u7528\u5230\u5176\u4ed6\u7c7b\u578b\u7684\u503c\u4e0a\u9762\u3002<\/p>\n<p>\u7ee7\u627f<\/p>\n<p>\u7ee7\u627f\u7ed9\u5bf9\u8c61\u63d0\u4f9b\u4e86\u4ece\u57fa\u7c7b\u83b7\u53d6\u5b57\u6bb5\u548c\u65b9\u6cd5\u7684\u80fd\u529b\u3002\u7ee7\u627f\u63d0\u4f9b\u4e86\u4ee3\u7801\u7684\u91cd\u7528\u884c\uff0c\u4e5f\u53ef\u4ee5\u5728\u4e0d\u4fee\u6539\u7c7b\u7684\u60c5\u51b5\u4e0b\u7ed9\u73b0\u5b58\u7684\u7c7b\u6dfb\u52a0\u65b0\u7279\u6027\u3002<\/p>\n<p>\u62bd\u8c61<\/p>\n<p>\u62bd\u8c61\u662f\u628a\u60f3\u6cd5\u4ece\u5177\u4f53\u7684\u5b9e\u4f8b\u4e2d\u5206\u79bb\u51fa\u6765\u7684\u6b65\u9aa4\uff0c\u56e0\u6b64\uff0c\u8981\u6839\u636e\u4ed6\u4eec\u7684\u529f\u80fd\u800c\u4e0d\u662f\u5b9e\u73b0\u7ec6\u8282\u6765\u521b\u5efa\u7c7b\u3002Java\u652f\u6301\u521b\u5efa\u53ea\u66b4\u6f0f\u63a5\u53e3\u800c\u4e0d\u5305\u542b\u65b9\u6cd5\u5b9e\u73b0\u7684\u62bd\u8c61\u7684\u7c7b\u3002\u8fd9\u79cd\u62bd\u8c61\u6280\u672f\u7684\u4e3b\u8981\u76ee\u7684\u662f\u628a\u7c7b\u7684\u884c\u4e3a\u548c\u5b9e\u73b0\u7ec6\u8282\u5206\u79bb\u5f00\u3002<\/p>\n<p>\u62bd\u8c61\u548c\u5c01\u88c5\u7684\u4e0d\u540c\u70b9<\/p>\n<p>\u62bd\u8c61\u548c\u5c01\u88c5\u662f\u4e92\u8865\u7684\u6982\u5ff5\u3002\u4e00\u65b9\u9762\uff0c\u62bd\u8c61\u5173\u6ce8\u5bf9\u8c61\u7684\u884c\u4e3a\u3002\u53e6\u4e00\u65b9\u9762\uff0c\u5c01\u88c5\u5173\u6ce8\u5bf9\u8c61\u884c\u4e3a\u7684\u7ec6\u8282\u3002\u4e00\u822c\u662f\u901a\u8fc7\u9690\u85cf\u5bf9\u8c61\u5185\u90e8\u72b6\u6001\u4fe1\u606f\u505a\u5230\u5c01\u88c5\uff0c\u56e0\u6b64\uff0c\u5c01\u88c5\u53ef\u4ee5\u770b\u6210\u662f\u7528\u6765\u63d0\u4f9b\u62bd\u8c61\u7684\u4e00\u79cd\u7b56\u7565\u3002<\/p>\n<p><span id=\"general\">\u5e38\u89c1\u7684Java\u95ee\u9898<\/span><\/p>\n<p>1.\u4ec0\u4e48\u662fJava\u865a\u62df\u673a\uff1f\u4e3a\u4ec0\u4e48Java\u88ab\u79f0\u4f5c\u662f\u201c\u5e73\u53f0\u65e0\u5173\u7684\u7f16\u7a0b\u8bed\u8a00\u201d\uff1f<\/p>\n<p>Java\u865a\u62df\u673a\u662f\u4e00\u4e2a\u53ef\u4ee5\u6267\u884cJava\u5b57\u8282\u7801\u7684\u865a\u62df\u673a\u8fdb\u7a0b\u3002Java\u6e90\u6587\u4ef6\u88ab\u7f16\u8bd1\u6210\u80fd\u88abJava\u865a\u62df\u673a\u6267\u884c\u7684\u5b57\u8282\u7801\u6587\u4ef6\u3002<\/p>\n<p>Java\u88ab\u8bbe\u8ba1\u6210\u5141\u8bb8\u5e94\u7528\u7a0b\u5e8f\u53ef\u4ee5\u8fd0\u884c\u5728\u4efb\u610f\u7684\u5e73\u53f0\uff0c\u800c\u4e0d\u9700\u8981\u7a0b\u5e8f\u5458\u4e3a\u6bcf\u4e00\u4e2a\u5e73\u53f0\u5355\u72ec\u91cd\u5199\u6216\u8005\u662f\u91cd\u65b0\u7f16\u8bd1\u3002Java\u865a\u62df\u673a\u8ba9\u8fd9\u4e2a\u53d8\u4e3a\u53ef\u80fd\uff0c\u56e0\u4e3a\u5b83\u77e5\u9053\u5e95\u5c42\u786c\u4ef6\u5e73\u53f0\u7684\u6307\u4ee4\u957f\u5ea6\u548c\u5176\u4ed6\u7279\u6027\u3002<\/p>\n<p>2.JDK\u548cJRE\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/p>\n<p>Java\u8fd0\u884c\u65f6\u73af\u5883(JRE)\u662f\u5c06\u8981\u6267\u884cJava\u7a0b\u5e8f\u7684Java\u865a\u62df\u673a\u3002\u5b83\u540c\u65f6\u4e5f\u5305\u542b\u4e86\u6267\u884capplet\u9700\u8981\u7684\u6d4f\u89c8\u5668\u63d2\u4ef6\u3002Java\u5f00\u53d1\u5de5\u5177\u5305(JDK)\u662f\u5b8c\u6574\u7684Java\u8f6f\u4ef6\u5f00\u53d1\u5305\uff0c\u5305\u542b\u4e86JRE\uff0c\u7f16\u8bd1\u5668\u548c\u5176\u4ed6\u7684\u5de5\u5177(\u6bd4\u5982\uff1aJavaDoc\uff0cJava\u8c03\u8bd5\u5668)\uff0c\u53ef\u4ee5\u8ba9\u5f00\u53d1\u8005\u5f00\u53d1\u3001\u7f16\u8bd1\u3001\u6267\u884cJava\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n<p>3.\u201dstatic\u201d\u5173\u952e\u5b57\u662f\u4ec0\u4e48\u610f\u601d\uff1fJava\u4e2d\u662f\u5426\u53ef\u4ee5\u8986\u76d6(override)\u4e00\u4e2aprivate\u6216\u8005\u662fstatic\u7684\u65b9\u6cd5\uff1f<\/p>\n<p>\u201cstatic\u201d\u5173\u952e\u5b57\u8868\u660e\u4e00\u4e2a\u6210\u5458\u53d8\u91cf\u6216\u8005\u662f\u6210\u5458\u65b9\u6cd5\u53ef\u4ee5\u5728\u6ca1\u6709\u6240\u5c5e\u7684\u7c7b\u7684\u5b9e\u4f8b\u53d8\u91cf\u7684\u60c5\u51b5\u4e0b\u88ab\u8bbf\u95ee\u3002<br \/>\nJava\u4e2dstatic\u65b9\u6cd5\u4e0d\u80fd\u88ab\u8986\u76d6\uff0c\u56e0\u4e3a\u65b9\u6cd5\u8986\u76d6\u662f\u57fa\u4e8e\u8fd0\u884c\u65f6\u52a8\u6001\u7ed1\u5b9a\u7684\uff0c\u800cstatic\u65b9\u6cd5\u662f\u7f16\u8bd1\u65f6\u9759\u6001\u7ed1\u5b9a\u7684\u3002static\u65b9\u6cd5\u8ddf\u7c7b\u7684\u4efb\u4f55\u5b9e\u4f8b\u90fd\u4e0d\u76f8\u5173\uff0c\u6240\u4ee5\u6982\u5ff5\u4e0a\u4e0d\u9002\u7528\u3002<\/p>\n<p>4.\u662f\u5426\u53ef\u4ee5\u5728static\u73af\u5883\u4e2d\u8bbf\u95ee\u975estatic\u53d8\u91cf\uff1f<\/p>\n<p>static\u53d8\u91cf\u5728Java\u4e2d\u662f\u5c5e\u4e8e\u7c7b\u7684\uff0c\u5b83\u5728\u6240\u6709\u7684\u5b9e\u4f8b\u4e2d\u7684\u503c\u662f\u4e00\u6837\u7684\u3002\u5f53\u7c7b\u88abJava\u865a\u62df\u673a\u8f7d\u5165\u7684\u65f6\u5019\uff0c\u4f1a\u5bf9static\u53d8\u91cf\u8fdb\u884c\u521d\u59cb\u5316\u3002\u5982\u679c\u4f60\u7684\u4ee3\u7801\u5c1d\u8bd5\u4e0d\u7528\u5b9e\u4f8b\u6765\u8bbf\u95ee\u975estatic\u7684\u53d8\u91cf\uff0c\u7f16\u8bd1\u5668\u4f1a\u62a5\u9519\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u53d8\u91cf\u8fd8\u6ca1\u6709\u88ab\u521b\u5efa\u51fa\u6765\uff0c\u8fd8\u6ca1\u6709\u8ddf\u4efb\u4f55\u5b9e\u4f8b\u5173\u8054\u4e0a\u3002<\/p>\n<p>5.Java\u652f\u6301\u7684\u6570\u636e\u7c7b\u578b\u6709\u54ea\u4e9b\uff1f\u4ec0\u4e48\u662f\u81ea\u52a8\u62c6\u88c5\u7bb1\uff1f<\/p>\n<p>Java\u8bed\u8a00\u652f\u6301\u76848\u4e2d\u57fa\u672c\u6570\u636e\u7c7b\u578b\u662f\uff1a<\/p>\n<ul>\n<li>byte<\/li>\n<li>short<\/li>\n<li>int<\/li>\n<li>long<\/li>\n<li>float<\/li>\n<li>double<\/li>\n<li>boolean<\/li>\n<li>char<\/li>\n<\/ul>\n<p>\u81ea\u52a8\u88c5\u7bb1\u662fJava\u7f16\u8bd1\u5668\u5728\u57fa\u672c\u6570\u636e\u7c7b\u578b\u548c\u5bf9\u5e94\u7684\u5bf9\u8c61\u5305\u88c5\u7c7b\u578b\u4e4b\u95f4\u505a\u7684\u4e00\u4e2a\u8f6c\u5316\u3002\u6bd4\u5982\uff1a\u628aint\u8f6c\u5316\u6210Integer\uff0cdouble\u8f6c\u5316\u6210double\uff0c\u7b49\u7b49\u3002\u53cd\u4e4b\u5c31\u662f\u81ea\u52a8\u62c6\u7bb1\u3002<\/p>\n<p>6.Java\u4e2d\u7684\u65b9\u6cd5\u8986\u76d6(Overriding)\u548c\u65b9\u6cd5\u91cd\u8f7d(Overloading)\u662f\u4ec0\u4e48\u610f\u601d\uff1f<\/p>\n<p>Java\u4e2d\u7684\u65b9\u6cd5\u91cd\u8f7d\u53d1\u751f\u5728\u540c\u4e00\u4e2a\u7c7b\u91cc\u9762\u4e24\u4e2a\u6216\u8005\u662f\u591a\u4e2a\u65b9\u6cd5\u7684\u65b9\u6cd5\u540d\u76f8\u540c\u4f46\u662f\u53c2\u6570\u4e0d\u540c\u7684\u60c5\u51b5\u3002\u4e0e\u6b64\u76f8\u5bf9\uff0c\u65b9\u6cd5\u8986\u76d6\u662f\u8bf4\u5b50\u7c7b\u91cd\u65b0\u5b9a\u4e49\u4e86\u7236\u7c7b\u7684\u65b9\u6cd5\u3002\u65b9\u6cd5\u8986\u76d6\u5fc5\u987b\u6709\u76f8\u540c\u7684\u65b9\u6cd5\u540d\uff0c\u53c2\u6570\u5217\u8868\u548c\u8fd4\u56de\u7c7b\u578b\u3002\u8986\u76d6\u8005\u53ef\u80fd\u4e0d\u4f1a\u9650\u5236\u5b83\u6240\u8986\u76d6\u7684\u65b9\u6cd5\u7684\u8bbf\u95ee\u3002<\/p>\n<p>7.Java\u4e2d\uff0c\u4ec0\u4e48\u662f\u6784\u9020\u51fd\u6570\uff1f\u4ec0\u4e48\u662f\u6784\u9020\u51fd\u6570\u91cd\u8f7d\uff1f\u4ec0\u4e48\u662f\u590d\u5236\u6784\u9020\u51fd\u6570\uff1f<\/p>\n<p>\u5f53\u65b0\u5bf9\u8c61\u88ab\u521b\u5efa\u7684\u65f6\u5019\uff0c\u6784\u9020\u51fd\u6570\u4f1a\u88ab\u8c03\u7528\u3002\u6bcf\u4e00\u4e2a\u7c7b\u90fd\u6709\u6784\u9020\u51fd\u6570\u3002\u5728\u7a0b\u5e8f\u5458\u6ca1\u6709\u7ed9\u7c7b\u63d0\u4f9b\u6784\u9020\u51fd\u6570\u7684\u60c5\u51b5\u4e0b\uff0cJava\u7f16\u8bd1\u5668\u4f1a\u4e3a\u8fd9\u4e2a\u7c7b\u521b\u5efa\u4e00\u4e2a\u9ed8\u8ba4\u7684\u6784\u9020\u51fd\u6570\u3002<\/p>\n<p>Java\u4e2d\u6784\u9020\u51fd\u6570\u91cd\u8f7d\u548c\u65b9\u6cd5\u91cd\u8f7d\u5f88\u76f8\u4f3c\u3002\u53ef\u4ee5\u4e3a\u4e00\u4e2a\u7c7b\u521b\u5efa\u591a\u4e2a\u6784\u9020\u51fd\u6570\u3002\u6bcf\u4e00\u4e2a\u6784\u9020\u51fd\u6570\u5fc5\u987b\u6709\u5b83\u81ea\u5df1\u552f\u4e00\u7684\u53c2\u6570\u5217\u8868\u3002<\/p>\n<p>Java\u4e0d\u652f\u6301\u50cfC++\u4e2d\u90a3\u6837\u7684\u590d\u5236\u6784\u9020\u51fd\u6570\uff0c\u8fd9\u4e2a\u4e0d\u540c\u70b9\u662f\u56e0\u4e3a\u5982\u679c\u4f60\u4e0d\u81ea\u5df1\u5199\u6784\u9020\u51fd\u6570\u7684\u60c5\u51b5\u4e0b\uff0cJava\u4e0d\u4f1a\u521b\u5efa\u9ed8\u8ba4\u7684\u590d\u5236\u6784\u9020\u51fd\u6570\u3002<\/p>\n<p>8.Java\u652f\u6301\u591a\u7ee7\u627f\u4e48\uff1f<\/p>\n<p>\u4e0d\u652f\u6301\uff0cJava\u4e0d\u652f\u6301\u591a\u7ee7\u627f\u3002\u6bcf\u4e2a\u7c7b\u90fd\u53ea\u80fd\u7ee7\u627f\u4e00\u4e2a\u7c7b\uff0c\u4f46\u662f\u53ef\u4ee5\u5b9e\u73b0\u591a\u4e2a\u63a5\u53e3\u3002<\/p>\n<p>9.\u63a5\u53e3\u548c\u62bd\u8c61\u7c7b\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/p>\n<p>Java\u63d0\u4f9b\u548c\u652f\u6301\u521b\u5efa\u62bd\u8c61\u7c7b\u548c\u63a5\u53e3\u3002\u5b83\u4eec\u7684\u5b9e\u73b0\u6709\u5171\u540c\u70b9\uff0c\u4e0d\u540c\u70b9\u5728\u4e8e\uff1a<\/p>\n<ul>\n<li>\u63a5\u53e3\u4e2d\u6240\u6709\u7684\u65b9\u6cd5\u9690\u542b\u7684\u90fd\u662f\u62bd\u8c61\u7684\u3002\u800c\u62bd\u8c61\u7c7b\u5219\u53ef\u4ee5\u540c\u65f6\u5305\u542b\u62bd\u8c61\u548c\u975e\u62bd\u8c61\u7684\u65b9\u6cd5\u3002<\/li>\n<li>\u7c7b\u53ef\u4ee5\u5b9e\u73b0\u5f88\u591a\u4e2a\u63a5\u53e3\uff0c\u4f46\u662f\u53ea\u80fd\u7ee7\u627f\u4e00\u4e2a\u62bd\u8c61\u7c7b<\/li>\n<li>\u7c7b\u5982\u679c\u8981\u5b9e\u73b0\u4e00\u4e2a\u63a5\u53e3\uff0c\u5b83\u5fc5\u987b\u8981\u5b9e\u73b0\u63a5\u53e3\u58f0\u660e\u7684\u6240\u6709\u65b9\u6cd5\u3002\u4f46\u662f\uff0c\u7c7b\u53ef\u4ee5\u4e0d\u5b9e\u73b0\u62bd\u8c61\u7c7b\u58f0\u660e\u7684\u6240\u6709\u65b9\u6cd5\uff0c\u5f53\u7136\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u7c7b\u4e5f\u5fc5\u987b\u5f97\u58f0\u660e\u6210\u662f\u62bd\u8c61\u7684\u3002<\/li>\n<li>\u62bd\u8c61\u7c7b\u53ef\u4ee5\u5728\u4e0d\u63d0\u4f9b\u63a5\u53e3\u65b9\u6cd5\u5b9e\u73b0\u7684\u60c5\u51b5\u4e0b\u5b9e\u73b0\u63a5\u53e3\u3002<\/li>\n<li>Java\u63a5\u53e3\u4e2d\u58f0\u660e\u7684\u53d8\u91cf\u9ed8\u8ba4\u90fd\u662ffinal\u7684\u3002\u62bd\u8c61\u7c7b\u53ef\u4ee5\u5305\u542b\u975efinal\u7684\u53d8\u91cf\u3002<\/li>\n<li>Java\u63a5\u53e3\u4e2d\u7684\u6210\u5458\u51fd\u6570\u9ed8\u8ba4\u662fpublic\u7684\u3002\u62bd\u8c61\u7c7b\u7684\u6210\u5458\u51fd\u6570\u53ef\u4ee5\u662fprivate\uff0cprotected\u6216\u8005\u662fpublic\u3002<\/li>\n<li>\u63a5\u53e3\u662f\u7edd\u5bf9\u62bd\u8c61\u7684\uff0c\u4e0d\u53ef\u4ee5\u88ab\u5b9e\u4f8b\u5316\u3002\u62bd\u8c61\u7c7b\u4e5f\u4e0d\u53ef\u4ee5\u88ab\u5b9e\u4f8b\u5316\uff0c\u4f46\u662f\uff0c\u5982\u679c\u5b83\u5305\u542bmain\u65b9\u6cd5\u7684\u8bdd\u662f\u53ef\u4ee5\u88ab\u8c03\u7528\u7684\u3002<\/li>\n<\/ul>\n<p>\u4e5f\u53ef\u4ee5\u53c2\u8003<a class=\"external\" href=\"http:\/\/www.javacodegeeks.com\/2014\/04\/abstract-class-versus-interface-in-the-jdk-8-era.html\" target=\"_blank\" rel=\"nofollow\">JDK8\u4e2d\u62bd\u8c61\u7c7b\u548c\u63a5\u53e3\u7684\u533a\u522b<\/a><\/p>\n<p>10.\u4ec0\u4e48\u662f\u503c\u4f20\u9012\u548c\u5f15\u7528\u4f20\u9012\uff1f<\/p>\n<p>\u5bf9\u8c61\u88ab\u503c\u4f20\u9012\uff0c\u610f\u5473\u7740\u4f20\u9012\u4e86\u5bf9\u8c61\u7684\u4e00\u4e2a\u526f\u672c\u3002\u56e0\u6b64\uff0c\u5c31\u7b97\u662f\u6539\u53d8\u4e86\u5bf9\u8c61\u526f\u672c\uff0c\u4e5f\u4e0d\u4f1a\u5f71\u54cd\u6e90\u5bf9\u8c61\u7684\u503c\u3002<\/p>\n<p>\u5bf9\u8c61\u88ab\u5f15\u7528\u4f20\u9012\uff0c\u610f\u5473\u7740\u4f20\u9012\u7684\u5e76\u4e0d\u662f\u5b9e\u9645\u7684\u5bf9\u8c61\uff0c\u800c\u662f\u5bf9\u8c61\u7684\u5f15\u7528\u3002\u56e0\u6b64\uff0c\u5916\u90e8\u5bf9\u5f15\u7528\u5bf9\u8c61\u6240\u505a\u7684\u6539\u53d8\u4f1a\u53cd\u6620\u5230\u6240\u6709\u7684\u5bf9\u8c61\u4e0a\u3002<\/p>\n<p><span id=\"thread\">Java\u7ebf\u7a0b<\/span><\/p>\n<p>11.\u8fdb\u7a0b\u548c\u7ebf\u7a0b\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/p>\n<p>\u8fdb\u7a0b\u662f\u6267\u884c\u7740\u7684\u5e94\u7528\u7a0b\u5e8f\uff0c\u800c\u7ebf\u7a0b\u662f\u8fdb\u7a0b\u5185\u90e8\u7684\u4e00\u4e2a\u6267\u884c\u5e8f\u5217\u3002\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u6709\u591a\u4e2a\u7ebf\u7a0b\u3002\u7ebf\u7a0b\u53c8\u53eb\u505a\u8f7b\u91cf\u7ea7\u8fdb\u7a0b\u3002<\/p>\n<p>12.\u521b\u5efa\u7ebf\u7a0b\u6709\u51e0\u79cd\u4e0d\u540c\u7684\u65b9\u5f0f\uff1f\u4f60\u559c\u6b22\u54ea\u4e00\u79cd\uff1f\u4e3a\u4ec0\u4e48\uff1f<\/p>\n<p>\u6709\u4e09\u79cd\u65b9\u5f0f\u53ef\u4ee5\u7528\u6765\u521b\u5efa\u7ebf\u7a0b\uff1a<\/p>\n<ul>\n<li>\u7ee7\u627fThread\u7c7b<\/li>\n<li>\u5b9e\u73b0Runnable\u63a5\u53e3<\/li>\n<li>\u5e94\u7528\u7a0b\u5e8f\u53ef\u4ee5\u4f7f\u7528Executor\u6846\u67b6\u6765\u521b\u5efa\u7ebf\u7a0b\u6c60<\/li>\n<\/ul>\n<p>\u5b9e\u73b0Runnable\u63a5\u53e3\u8fd9\u79cd\u65b9\u5f0f\u66f4\u53d7\u6b22\u8fce\uff0c\u56e0\u4e3a\u8fd9\u4e0d\u9700\u8981\u7ee7\u627fThread\u7c7b\u3002\u5728\u5e94\u7528\u8bbe\u8ba1\u4e2d\u5df2\u7ecf\u7ee7\u627f\u4e86\u522b\u7684\u5bf9\u8c61\u7684\u60c5\u51b5\u4e0b\uff0c\u8fd9\u9700\u8981\u591a\u7ee7\u627f\uff08\u800cJava\u4e0d\u652f\u6301\u591a\u7ee7\u627f\uff09\uff0c\u53ea\u80fd\u5b9e\u73b0\u63a5\u53e3\u3002\u540c\u65f6\uff0c\u7ebf\u7a0b\u6c60\u4e5f\u662f\u975e\u5e38\u9ad8\u6548\u7684\uff0c\u5f88\u5bb9\u6613\u5b9e\u73b0\u548c\u4f7f\u7528\u3002<\/p>\n<p>13.\u6982\u62ec\u7684\u89e3\u91ca\u4e0b\u7ebf\u7a0b\u7684\u51e0\u79cd\u53ef\u7528\u72b6\u6001\u3002<\/p>\n<p>\u7ebf\u7a0b\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\uff0c\u53ef\u4ee5\u5904\u4e8e\u4e0b\u9762\u51e0\u79cd\u72b6\u6001\uff1a<\/p>\n<ul>\n<li>\u5c31\u7eea(Runnable):\u7ebf\u7a0b\u51c6\u5907\u8fd0\u884c\uff0c\u4e0d\u4e00\u5b9a\u7acb\u9a6c\u5c31\u80fd\u5f00\u59cb\u6267\u884c\u3002<\/li>\n<li>\u8fd0\u884c\u4e2d(Running)\uff1a\u8fdb\u7a0b\u6b63\u5728\u6267\u884c\u7ebf\u7a0b\u7684\u4ee3\u7801\u3002<\/li>\n<li>\u7b49\u5f85\u4e2d(Waiting):\u7ebf\u7a0b\u5904\u4e8e\u963b\u585e\u7684\u72b6\u6001\uff0c\u7b49\u5f85\u5916\u90e8\u7684\u5904\u7406\u7ed3\u675f\u3002<\/li>\n<li>\u7761\u7720\u4e2d(Sleeping)\uff1a\u7ebf\u7a0b\u88ab\u5f3a\u5236\u7761\u7720\u3002<\/li>\n<li>I\/O\u963b\u585e(Blocked on I\/O)\uff1a\u7b49\u5f85I\/O\u64cd\u4f5c\u5b8c\u6210\u3002<\/li>\n<li>\u540c\u6b65\u963b\u585e(Blocked on Synchronization)\uff1a\u7b49\u5f85\u83b7\u53d6\u9501\u3002<\/li>\n<li>\u6b7b\u4ea1(Dead)\uff1a\u7ebf\u7a0b\u5b8c\u6210\u4e86\u6267\u884c\u3002<\/li>\n<\/ul>\n<p>14.\u540c\u6b65\u65b9\u6cd5\u548c\u540c\u6b65\u4ee3\u7801\u5757\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/p>\n<p>\u5728Java\u8bed\u8a00\u4e2d\uff0c\u6bcf\u4e00\u4e2a\u5bf9\u8c61\u6709\u4e00\u628a\u9501\u3002\u7ebf\u7a0b\u53ef\u4ee5\u4f7f\u7528synchronized\u5173\u952e\u5b57\u6765\u83b7\u53d6\u5bf9\u8c61\u4e0a\u7684\u9501\u3002synchronized\u5173\u952e\u5b57\u53ef\u5e94\u7528\u5728\u65b9\u6cd5\u7ea7\u522b(\u7c97\u7c92\u5ea6\u9501)\u6216\u8005\u662f\u4ee3\u7801\u5757\u7ea7\u522b(\u7ec6\u7c92\u5ea6\u9501)\u3002<\/p>\n<p>15.\u5728\u76d1\u89c6\u5668(Monitor)\u5185\u90e8\uff0c\u662f\u5982\u4f55\u505a\u7ebf\u7a0b\u540c\u6b65\u7684\uff1f\u7a0b\u5e8f\u5e94\u8be5\u505a\u54ea\u79cd\u7ea7\u522b\u7684\u540c\u6b65\uff1f<\/p>\n<p>\u76d1\u89c6\u5668\u548c\u9501\u5728Java\u865a\u62df\u673a\u4e2d\u662f\u4e00\u5757\u4f7f\u7528\u7684\u3002\u76d1\u89c6\u5668\u76d1\u89c6\u4e00\u5757\u540c\u6b65\u4ee3\u7801\u5757\uff0c\u786e\u4fdd\u4e00\u6b21\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\u540c\u6b65\u4ee3\u7801\u5757\u3002\u6bcf\u4e00\u4e2a\u76d1\u89c6\u5668\u90fd\u548c\u4e00\u4e2a\u5bf9\u8c61\u5f15\u7528\u76f8\u5173\u8054\u3002\u7ebf\u7a0b\u5728\u83b7\u53d6\u9501\u4e4b\u524d\u4e0d\u5141\u8bb8\u6267\u884c\u540c\u6b65\u4ee3\u7801\u3002<\/p>\n<p>16.\u4ec0\u4e48\u662f\u6b7b\u9501(deadlock)\uff1f<\/p>\n<p>\u4e24\u4e2a\u8fdb\u7a0b\u90fd\u5728\u7b49\u5f85\u5bf9\u65b9\u6267\u884c\u5b8c\u6bd5\u624d\u80fd\u7ee7\u7eed\u5f80\u4e0b\u6267\u884c\u7684\u65f6\u5019\u5c31\u53d1\u751f\u4e86\u6b7b\u9501\u3002\u7ed3\u679c\u5c31\u662f\u4e24\u4e2a\u8fdb\u7a0b\u90fd\u9677\u5165\u4e86\u65e0\u9650\u7684\u7b49\u5f85\u4e2d\u3002<\/p>\n<p>17.\u5982\u4f55\u786e\u4fddN\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u8bbf\u95eeN\u4e2a\u8d44\u6e90\u540c\u65f6\u53c8\u4e0d\u5bfc\u81f4\u6b7b\u9501\uff1f<\/p>\n<p>\u4f7f\u7528\u591a\u7ebf\u7a0b\u7684\u65f6\u5019\uff0c\u4e00\u79cd\u975e\u5e38\u7b80\u5355\u7684\u907f\u514d\u6b7b\u9501\u7684\u65b9\u5f0f\u5c31\u662f\uff1a\u6307\u5b9a\u83b7\u53d6\u9501\u7684\u987a\u5e8f\uff0c\u5e76\u5f3a\u5236\u7ebf\u7a0b\u6309\u7167\u6307\u5b9a\u7684\u987a\u5e8f\u83b7\u53d6\u9501\u3002\u56e0\u6b64\uff0c\u5982\u679c\u6240\u6709\u7684\u7ebf\u7a0b\u90fd\u662f\u4ee5\u540c\u6837\u7684\u987a\u5e8f\u52a0\u9501\u548c\u91ca\u653e\u9501\uff0c\u5c31\u4e0d\u4f1a\u51fa\u73b0\u6b7b\u9501\u4e86\u3002<\/p>\n<p><span id=\"collection\">Java\u96c6\u5408\u7c7b<\/span><\/p>\n<p>18.Java\u96c6\u5408\u7c7b\u6846\u67b6\u7684\u57fa\u672c\u63a5\u53e3\u6709\u54ea\u4e9b\uff1f<\/p>\n<p>Java\u96c6\u5408\u7c7b\u63d0\u4f9b\u4e86\u4e00\u5957\u8bbe\u8ba1\u826f\u597d\u7684\u652f\u6301\u5bf9\u4e00\u7ec4\u5bf9\u8c61\u8fdb\u884c\u64cd\u4f5c\u7684\u63a5\u53e3\u548c\u7c7b\u3002Java\u96c6\u5408\u7c7b\u91cc\u9762\u6700\u57fa\u672c\u7684\u63a5\u53e3\u6709\uff1a<\/p>\n<ul>\n<li>Collection\uff1a\u4ee3\u8868\u4e00\u7ec4\u5bf9\u8c61\uff0c\u6bcf\u4e00\u4e2a\u5bf9\u8c61\u90fd\u662f\u5b83\u7684\u5b50\u5143\u7d20\u3002<\/li>\n<li>Set\uff1a\u4e0d\u5305\u542b\u91cd\u590d\u5143\u7d20\u7684Collection\u3002<\/li>\n<li>List\uff1a\u6709\u987a\u5e8f\u7684collection\uff0c\u5e76\u4e14\u53ef\u4ee5\u5305\u542b\u91cd\u590d\u5143\u7d20\u3002<\/li>\n<li>Map\uff1a\u53ef\u4ee5\u628a\u952e(key)\u6620\u5c04\u5230\u503c(value)\u7684\u5bf9\u8c61\uff0c\u952e\u4e0d\u80fd\u91cd\u590d\u3002<\/li>\n<\/ul>\n<p>19.\u4e3a\u4ec0\u4e48\u96c6\u5408\u7c7b\u6ca1\u6709\u5b9e\u73b0Cloneable\u548cSerializable\u63a5\u53e3\uff1f<\/p>\n<p>\u96c6\u5408\u7c7b\u63a5\u53e3\u6307\u5b9a\u4e86\u4e00\u7ec4\u53eb\u505a\u5143\u7d20\u7684\u5bf9\u8c61\u3002\u96c6\u5408\u7c7b\u63a5\u53e3\u7684\u6bcf\u4e00\u79cd\u5177\u4f53\u7684\u5b9e\u73b0\u7c7b\u90fd\u53ef\u4ee5\u9009\u62e9\u4ee5\u5b83\u81ea\u5df1\u7684\u65b9\u5f0f\u5bf9\u5143\u7d20\u8fdb\u884c\u4fdd\u5b58\u548c\u6392\u5e8f\u3002\u6709\u7684\u96c6\u5408\u7c7b\u5141\u8bb8\u91cd\u590d\u7684\u952e\uff0c\u6709\u4e9b\u4e0d\u5141\u8bb8\u3002<\/p>\n<p>20.\u4ec0\u4e48\u662f\u8fed\u4ee3\u5668(Iterator)\uff1f<\/p>\n<p>Iterator\u63a5\u53e3\u63d0\u4f9b\u4e86\u5f88\u591a\u5bf9\u96c6\u5408\u5143\u7d20\u8fdb\u884c\u8fed\u4ee3\u7684\u65b9\u6cd5\u3002\u6bcf\u4e00\u4e2a\u96c6\u5408\u7c7b\u90fd\u5305\u542b\u4e86\u53ef\u4ee5\u8fd4\u56de\u8fed\u4ee3\u5668\u5b9e\u4f8b\u7684<br \/>\n\u8fed\u4ee3\u65b9\u6cd5\u3002\u8fed\u4ee3\u5668\u53ef\u4ee5\u5728\u8fed\u4ee3\u7684\u8fc7\u7a0b\u4e2d\u5220\u9664\u5e95\u5c42\u96c6\u5408\u7684\u5143\u7d20\u3002<\/p>\n<p>\u514b\u9686(cloning)\u6216\u8005\u662f\u5e8f\u5217\u5316(serialization)\u7684\u8bed\u4e49\u548c\u542b\u4e49\u662f\u8ddf\u5177\u4f53\u7684\u5b9e\u73b0\u76f8\u5173\u7684\u3002\u56e0\u6b64\uff0c\u5e94\u8be5\u7531\u96c6\u5408\u7c7b\u7684\u5177\u4f53\u5b9e\u73b0\u6765\u51b3\u5b9a\u5982\u4f55\u88ab\u514b\u9686\u6216\u8005\u662f\u5e8f\u5217\u5316\u3002<\/p>\n<p>21.Iterator\u548cListIterator\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/p>\n<p>\u4e0b\u9762\u5217\u51fa\u4e86\u4ed6\u4eec\u7684\u533a\u522b\uff1a<\/p>\n<ul>\n<li>Iterator\u53ef\u7528\u6765\u904d\u5386Set\u548cList\u96c6\u5408\uff0c\u4f46\u662fListIterator\u53ea\u80fd\u7528\u6765\u904d\u5386List\u3002<\/li>\n<li>Iterator\u5bf9\u96c6\u5408\u53ea\u80fd\u662f\u524d\u5411\u904d\u5386\uff0cListIterator\u65e2\u53ef\u4ee5\u524d\u5411\u4e5f\u53ef\u4ee5\u540e\u5411\u3002<\/li>\n<li>ListIterator\u5b9e\u73b0\u4e86Iterator\u63a5\u53e3\uff0c\u5e76\u5305\u542b\u5176\u4ed6\u7684\u529f\u80fd\uff0c\u6bd4\u5982\uff1a\u589e\u52a0\u5143\u7d20\uff0c\u66ff\u6362\u5143\u7d20\uff0c\u83b7\u53d6\u524d\u4e00\u4e2a\u548c\u540e\u4e00\u4e2a\u5143\u7d20\u7684\u7d22\u5f15\uff0c\u7b49\u7b49\u3002<\/li>\n<\/ul>\n<p>22.\u5feb\u901f\u5931\u8d25(fail-fast)\u548c\u5b89\u5168\u5931\u8d25(fail-safe)\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/p>\n<p>Iterator\u7684\u5b89\u5168\u5931\u8d25\u662f\u57fa\u4e8e\u5bf9\u5e95\u5c42\u96c6\u5408\u505a\u62f7\u8d1d\uff0c\u56e0\u6b64\uff0c\u5b83\u4e0d\u53d7\u6e90\u96c6\u5408\u4e0a\u4fee\u6539\u7684\u5f71\u54cd\u3002java.util\u5305\u4e0b\u9762\u7684\u6240\u6709\u7684\u96c6\u5408\u7c7b\u90fd\u662f\u5feb\u901f\u5931\u8d25\u7684\uff0c\u800cjava.util.concurrent\u5305\u4e0b\u9762\u7684\u6240\u6709\u7684\u7c7b\u90fd\u662f\u5b89\u5168\u5931\u8d25\u7684\u3002\u5feb\u901f\u5931\u8d25\u7684\u8fed\u4ee3\u5668\u4f1a\u629b\u51faConcurrentModificationException\u5f02\u5e38\uff0c\u800c\u5b89\u5168\u5931\u8d25\u7684\u8fed\u4ee3\u5668\u6c38\u8fdc\u4e0d\u4f1a\u629b\u51fa\u8fd9\u6837\u7684\u5f02\u5e38\u3002<\/p>\n<p>23.Java\u4e2d\u7684HashMap\u7684\u5de5\u4f5c\u539f\u7406\u662f\u4ec0\u4e48\uff1f<\/p>\n<p>Java\u4e2d\u7684HashMap\u662f\u4ee5\u952e\u503c\u5bf9(key-value)\u7684\u5f62\u5f0f\u5b58\u50a8\u5143\u7d20\u7684\u3002HashMap\u9700\u8981\u4e00\u4e2ahash\u51fd\u6570\uff0c\u5b83\u4f7f\u7528hashCode()\u548cequals()\u65b9\u6cd5\u6765\u5411\u96c6\u5408\/\u4ece\u96c6\u5408\u6dfb\u52a0\u548c\u68c0\u7d22\u5143\u7d20\u3002\u5f53\u8c03\u7528put()\u65b9\u6cd5\u7684\u65f6\u5019\uff0cHashMap\u4f1a\u8ba1\u7b97key\u7684hash\u503c\uff0c\u7136\u540e\u628a\u952e\u503c\u5bf9\u5b58\u50a8\u5728\u96c6\u5408\u4e2d\u5408\u9002\u7684\u7d22\u5f15\u4e0a\u3002\u5982\u679ckey\u5df2\u7ecf\u5b58\u5728\u4e86\uff0cvalue\u4f1a\u88ab\u66f4\u65b0\u6210\u65b0\u503c\u3002HashMap\u7684\u4e00\u4e9b\u91cd\u8981\u7684\u7279\u6027\u662f\u5b83\u7684\u5bb9\u91cf(capacity)\uff0c\u8d1f\u8f7d\u56e0\u5b50(load factor)\u548c\u6269\u5bb9\u6781\u9650(threshold resizing)\u3002<\/p>\n<p>24.hashCode()\u548cequals()\u65b9\u6cd5\u7684\u91cd\u8981\u6027\u4f53\u73b0\u5728\u4ec0\u4e48\u5730\u65b9\uff1f<\/p>\n<p>Java\u4e2d\u7684HashMap\u4f7f\u7528hashCode()\u548cequals()\u65b9\u6cd5\u6765\u786e\u5b9a\u952e\u503c\u5bf9\u7684\u7d22\u5f15\uff0c\u5f53\u6839\u636e\u952e\u83b7\u53d6\u503c\u7684\u65f6\u5019\u4e5f\u4f1a\u7528\u5230\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u3002\u5982\u679c\u6ca1\u6709\u6b63\u786e\u7684\u5b9e\u73b0\u8fd9\u4e24\u4e2a\u65b9\u6cd5\uff0c\u4e24\u4e2a\u4e0d\u540c\u7684\u952e\u53ef\u80fd\u4f1a\u6709\u76f8\u540c\u7684hash\u503c\uff0c\u56e0\u6b64\uff0c\u53ef\u80fd\u4f1a\u88ab\u96c6\u5408\u8ba4\u4e3a\u662f\u76f8\u7b49\u7684\u3002\u800c\u4e14\uff0c\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u4e5f\u7528\u6765\u53d1\u73b0\u91cd\u590d\u5143\u7d20\u3002\u6240\u4ee5\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u7684\u5b9e\u73b0\u5bf9HashMap\u7684\u7cbe\u786e\u6027\u548c\u6b63\u786e\u6027\u662f\u81f3\u5173\u91cd\u8981\u7684\u3002<\/p>\n<p>25.HashMap\u548cHashtable\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/p>\n<ul>\n<li>HashMap\u548cHashtable\u90fd\u5b9e\u73b0\u4e86Map\u63a5\u53e3\uff0c\u56e0\u6b64\u5f88\u591a\u7279\u6027\u975e\u5e38\u76f8\u4f3c\u3002\u4f46\u662f\uff0c\u4ed6\u4eec\u6709\u4ee5\u4e0b\u4e0d\u540c\u70b9\uff1a<\/li>\n<li>HashMap\u5141\u8bb8\u952e\u548c\u503c\u662fnull\uff0c\u800cHashtable\u4e0d\u5141\u8bb8\u952e\u6216\u8005\u503c\u662fnull\u3002<\/li>\n<li>Hashtable\u662f\u540c\u6b65\u7684\uff0c\u800cHashMap\u4e0d\u662f\u3002\u56e0\u6b64\uff0cHashMap\u66f4\u9002\u5408\u4e8e\u5355\u7ebf\u7a0b\u73af\u5883\uff0c\u800cHashtable\u9002\u5408\u4e8e\u591a\u7ebf\u7a0b\u73af\u5883\u3002<\/li>\n<li>HashMap\u63d0\u4f9b\u4e86\u53ef\u4f9b\u5e94\u7528\u8fed\u4ee3\u7684\u952e\u7684\u96c6\u5408\uff0c\u56e0\u6b64\uff0cHashMap\u662f\u5feb\u901f\u5931\u8d25\u7684\u3002\u53e6\u4e00\u65b9\u9762\uff0cHashtable\u63d0\u4f9b\u4e86\u5bf9\u952e\u7684\u5217\u4e3e(Enumeration)\u3002\n<ul>\n<li>\u4e00\u822c\u8ba4\u4e3aHashtable\u662f\u4e00\u4e2a\u9057\u7559\u7684\u7c7b\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>26.\u6570\u7ec4(Array)\u548c\u5217\u8868(ArrayList)\u6709\u4ec0\u4e48\u533a\u522b\uff1f\u4ec0\u4e48\u65f6\u5019\u5e94\u8be5\u4f7f\u7528Array\u800c\u4e0d\u662fArrayList\uff1f<\/p>\n<p>\u4e0b\u9762\u5217\u51fa\u4e86Array\u548cArrayList\u7684\u4e0d\u540c\u70b9\uff1a<\/p>\n<ul>\n<li>Array\u53ef\u4ee5\u5305\u542b\u57fa\u672c\u7c7b\u578b\u548c\u5bf9\u8c61\u7c7b\u578b\uff0cArrayList\u53ea\u80fd\u5305\u542b\u5bf9\u8c61\u7c7b\u578b\u3002<\/li>\n<li>Array\u5927\u5c0f\u662f\u56fa\u5b9a\u7684\uff0cArrayList\u7684\u5927\u5c0f\u662f\u52a8\u6001\u53d8\u5316\u7684\u3002<\/li>\n<li>ArrayList\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u65b9\u6cd5\u548c\u7279\u6027\uff0c\u6bd4\u5982\uff1aaddAll()\uff0cremoveAll()\uff0citerator()\u7b49\u7b49\u3002<\/li>\n<li>\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u6570\u636e\uff0c\u96c6\u5408\u4f7f\u7528\u81ea\u52a8\u88c5\u7bb1\u6765\u51cf\u5c11\u7f16\u7801\u5de5\u4f5c\u91cf\u3002\u4f46\u662f\uff0c\u5f53\u5904\u7406\u56fa\u5b9a\u5927\u5c0f\u7684\u57fa\u672c\u6570\u636e\u7c7b\u578b\u7684\u65f6\u5019\uff0c\u8fd9\u79cd\u65b9\u5f0f\u76f8\u5bf9\u6bd4\u8f83\u6162\u3002<\/li>\n<\/ul>\n<p>27.ArrayList\u548cLinkedList\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/p>\n<p>ArrayList\u548cLinkedList\u90fd\u5b9e\u73b0\u4e86List\u63a5\u53e3\uff0c\u4ed6\u4eec\u6709\u4ee5\u4e0b\u7684\u4e0d\u540c\u70b9\uff1a<\/p>\n<ul>\n<li>ArrayList\u662f\u57fa\u4e8e\u7d22\u5f15\u7684\u6570\u636e\u63a5\u53e3\uff0c\u5b83\u7684\u5e95\u5c42\u662f\u6570\u7ec4\u3002\u5b83\u53ef\u4ee5\u4ee5O(1)\u65f6\u95f4\u590d\u6742\u5ea6\u5bf9\u5143\u7d20\u8fdb\u884c\u968f\u673a\u8bbf\u95ee\u3002\u4e0e\u6b64\u5bf9\u5e94\uff0cLinkedList\u662f\u4ee5\u5143\u7d20\u5217\u8868\u7684\u5f62\u5f0f\u5b58\u50a8\u5b83\u7684\u6570\u636e\uff0c\u6bcf\u4e00\u4e2a\u5143\u7d20\u90fd\u548c\u5b83\u7684\u524d\u4e00\u4e2a\u548c\u540e\u4e00\u4e2a\u5143\u7d20\u94fe\u63a5\u5728\u4e00\u8d77\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u67e5\u627e\u67d0\u4e2a\u5143\u7d20\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662fO(n)\u3002<\/li>\n<li>\u76f8\u5bf9\u4e8eArrayList\uff0cLinkedList\u7684\u63d2\u5165\uff0c\u6dfb\u52a0\uff0c\u5220\u9664\u64cd\u4f5c\u901f\u5ea6\u66f4\u5feb\uff0c\u56e0\u4e3a\u5f53\u5143\u7d20\u88ab\u6dfb\u52a0\u5230\u96c6\u5408\u4efb\u610f\u4f4d\u7f6e\u7684\u65f6\u5019\uff0c\u4e0d\u9700\u8981\u50cf\u6570\u7ec4\u90a3\u6837\u91cd\u65b0\u8ba1\u7b97\u5927\u5c0f\u6216\u8005\u662f\u66f4\u65b0\u7d22\u5f15\u3002<\/li>\n<li>LinkedList\u6bd4ArrayList\u66f4\u5360\u5185\u5b58\uff0c\u56e0\u4e3aLinkedList\u4e3a\u6bcf\u4e00\u4e2a\u8282\u70b9\u5b58\u50a8\u4e86\u4e24\u4e2a\u5f15\u7528\uff0c\u4e00\u4e2a\u6307\u5411\u524d\u4e00\u4e2a\u5143\u7d20\uff0c\u4e00\u4e2a\u6307\u5411\u4e0b\u4e00\u4e2a\u5143\u7d20\u3002<\/li>\n<\/ul>\n<p>\u4e5f\u53ef\u4ee5\u53c2\u8003<a class=\"external\" href=\"http:\/\/www.javacodegeeks.com\/2013\/12\/arraylist-vs-linkedlist.html\" target=\"_blank\" rel=\"nofollow\">ArrayList vs. LinkedList<\/a>\u3002<\/p>\n<p>28.Comparable\u548cComparator\u63a5\u53e3\u662f\u5e72\u4ec0\u4e48\u7684\uff1f\u5217\u51fa\u5b83\u4eec\u7684\u533a\u522b\u3002<\/p>\n<p>Java\u63d0\u4f9b\u4e86\u53ea\u5305\u542b\u4e00\u4e2acompareTo()\u65b9\u6cd5\u7684Comparable\u63a5\u53e3\u3002\u8fd9\u4e2a\u65b9\u6cd5\u53ef\u4ee5\u4e2a\u7ed9\u4e24\u4e2a\u5bf9\u8c61\u6392\u5e8f\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u5b83\u8fd4\u56de\u8d1f\u6570\uff0c0\uff0c\u6b63\u6570\u6765\u8868\u660e\u8f93\u5165\u5bf9\u8c61\u5c0f\u4e8e\uff0c\u7b49\u4e8e\uff0c\u5927\u4e8e\u5df2\u7ecf\u5b58\u5728\u7684\u5bf9\u8c61\u3002<\/p>\n<p>Java\u63d0\u4f9b\u4e86\u5305\u542bcompare()\u548cequals()\u4e24\u4e2a\u65b9\u6cd5\u7684Comparator\u63a5\u53e3\u3002compare()\u65b9\u6cd5\u7528\u6765\u7ed9\u4e24\u4e2a\u8f93\u5165\u53c2\u6570\u6392\u5e8f\uff0c\u8fd4\u56de\u8d1f\u6570\uff0c0\uff0c\u6b63\u6570\u8868\u660e\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u5c0f\u4e8e\uff0c\u7b49\u4e8e\uff0c\u5927\u4e8e\u7b2c\u4e8c\u4e2a\u53c2\u6570\u3002equals()\u65b9\u6cd5\u9700\u8981\u4e00\u4e2a\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570\uff0c\u5b83\u7528\u6765\u51b3\u5b9a\u8f93\u5165\u53c2\u6570\u662f\u5426\u548ccomparator\u76f8\u7b49\u3002\u53ea\u6709\u5f53\u8f93\u5165\u53c2\u6570\u4e5f\u662f\u4e00\u4e2acomparator\u5e76\u4e14\u8f93\u5165\u53c2\u6570\u548c\u5f53\u524dcomparator\u7684\u6392\u5e8f\u7ed3\u679c\u662f\u76f8\u540c\u7684\u65f6\u5019\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u624d\u8fd4\u56detrue\u3002<\/p>\n<p>29.\u4ec0\u4e48\u662fJava\u4f18\u5148\u7ea7\u961f\u5217(Priority Queue)\uff1f<\/p>\n<p>PriorityQueue\u662f\u4e00\u4e2a\u57fa\u4e8e\u4f18\u5148\u7ea7\u5806\u7684\u65e0\u754c\u961f\u5217\uff0c\u5b83\u7684\u5143\u7d20\u662f\u6309\u7167\u81ea\u7136\u987a\u5e8f(natural order)\u6392\u5e8f\u7684\u3002\u5728\u521b\u5efa\u7684\u65f6\u5019\uff0c\u6211\u4eec\u53ef\u4ee5\u7ed9\u5b83\u63d0\u4f9b\u4e00\u4e2a\u8d1f\u8d23\u7ed9\u5143\u7d20\u6392\u5e8f\u7684\u6bd4\u8f83\u5668\u3002PriorityQueue\u4e0d\u5141\u8bb8null\u503c\uff0c\u56e0\u4e3a\u4ed6\u4eec\u6ca1\u6709\u81ea\u7136\u987a\u5e8f\uff0c\u6216\u8005\u8bf4\u4ed6\u4eec\u6ca1\u6709\u4efb\u4f55\u7684\u76f8\u5173\u8054\u7684\u6bd4\u8f83\u5668\u3002\u6700\u540e\uff0cPriorityQueue\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u5165\u961f\u548c\u51fa\u961f\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662fO(log(n))\u3002<\/p>\n<p>30.\u4f60\u4e86\u89e3\u5927O\u7b26\u53f7(big-O notation)\u4e48\uff1f\u4f60\u80fd\u7ed9\u51fa\u4e0d\u540c\u6570\u636e\u7ed3\u6784\u7684\u4f8b\u5b50\u4e48\uff1f<\/p>\n<p>\u5927O\u7b26\u53f7\u63cf\u8ff0\u4e86\u5f53\u6570\u636e\u7ed3\u6784\u91cc\u9762\u7684\u5143\u7d20\u589e\u52a0\u7684\u65f6\u5019\uff0c\u7b97\u6cd5\u7684\u89c4\u6a21\u6216\u8005\u662f\u6027\u80fd\u5728\u6700\u574f\u7684\u573a\u666f\u4e0b\u6709\u591a\u4e48\u597d\u3002<br \/>\n\u5927O\u7b26\u53f7\u4e5f\u53ef\u7528\u6765\u63cf\u8ff0\u5176\u4ed6\u7684\u884c\u4e3a\uff0c\u6bd4\u5982\uff1a\u5185\u5b58\u6d88\u8017\u3002\u56e0\u4e3a\u96c6\u5408\u7c7b\u5b9e\u9645\u4e0a\u662f\u6570\u636e\u7ed3\u6784\uff0c\u6211\u4eec\u4e00\u822c\u4f7f\u7528\u5927O\u7b26\u53f7\u57fa\u4e8e\u65f6\u95f4\uff0c\u5185\u5b58\u548c\u6027\u80fd\u6765\u9009\u62e9\u6700\u597d\u7684\u5b9e\u73b0\u3002\u5927O\u7b26\u53f7\u53ef\u4ee5\u5bf9\u5927\u91cf\u6570\u636e\u7684\u6027\u80fd\u7ed9\u51fa\u4e00\u4e2a\u5f88\u597d\u7684\u8bf4\u660e\u3002<\/p>\n<p>31.\u5982\u4f55\u6743\u8861\u662f\u4f7f\u7528\u65e0\u5e8f\u7684\u6570\u7ec4\u8fd8\u662f\u6709\u5e8f\u7684\u6570\u7ec4\uff1f<\/p>\n<p>\u6709\u5e8f\u6570\u7ec4\u6700\u5927\u7684\u597d\u5904\u5728\u4e8e\u67e5\u627e\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662fO(log n)\uff0c\u800c\u65e0\u5e8f\u6570\u7ec4\u662fO(n)\u3002\u6709\u5e8f\u6570\u7ec4\u7684\u7f3a\u70b9\u662f\u63d2\u5165\u64cd\u4f5c\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662fO(n)\uff0c\u56e0\u4e3a\u503c\u5927\u7684\u5143\u7d20\u9700\u8981\u5f80\u540e\u79fb\u52a8\u6765\u7ed9\u65b0\u5143\u7d20\u817e\u4f4d\u7f6e\u3002\u76f8\u53cd\uff0c\u65e0\u5e8f\u6570\u7ec4\u7684\u63d2\u5165\u65f6\u95f4\u590d\u6742\u5ea6\u662f\u5e38\u91cfO(1)\u3002<\/p>\n<p>32.Java\u96c6\u5408\u7c7b\u6846\u67b6\u7684\u6700\u4f73\u5b9e\u8df5\u6709\u54ea\u4e9b\uff1f<\/p>\n<ul>\n<li>\u6839\u636e\u5e94\u7528\u7684\u9700\u8981\u6b63\u786e\u9009\u62e9\u8981\u4f7f\u7528\u7684\u96c6\u5408\u7684\u7c7b\u578b\u5bf9\u6027\u80fd\u975e\u5e38\u91cd\u8981\uff0c\u6bd4\u5982\uff1a\u5047\u5982\u5143\u7d20\u7684\u5927\u5c0f\u662f\u56fa\u5b9a\u7684\uff0c\u800c\u4e14\u80fd\u4e8b\u5148\u77e5\u9053\uff0c\u6211\u4eec\u5c31\u5e94\u8be5\u7528Array\u800c\u4e0d\u662fArrayList\u3002<\/li>\n<li>\u6709\u4e9b\u96c6\u5408\u7c7b\u5141\u8bb8\u6307\u5b9a\u521d\u59cb\u5bb9\u91cf\u3002\u56e0\u6b64\uff0c\u5982\u679c\u6211\u4eec\u80fd\u4f30\u8ba1\u51fa\u5b58\u50a8\u7684\u5143\u7d20\u7684\u6570\u76ee\uff0c\u6211\u4eec\u53ef\u4ee5\u8bbe\u7f6e\u521d\u59cb\u5bb9\u91cf\u6765\u907f\u514d\u91cd\u65b0\u8ba1\u7b97hash\u503c\u6216\u8005\u662f\u6269\u5bb9\u3002<\/li>\n<li>\u4e3a\u4e86\u7c7b\u578b\u5b89\u5168\uff0c\u53ef\u8bfb\u6027\u548c\u5065\u58ee\u6027\u7684\u539f\u56e0\u603b\u662f\u8981\u4f7f\u7528\u6cdb\u578b\u3002\u540c\u65f6\uff0c\u4f7f\u7528\u6cdb\u578b\u8fd8\u53ef\u4ee5\u907f\u514d\u8fd0\u884c\u65f6\u7684ClassCastException\u3002<\/li>\n<li>\u4f7f\u7528JDK\u63d0\u4f9b\u7684\u4e0d\u53d8\u7c7b(immutable class)\u4f5c\u4e3aMap\u7684\u952e\u53ef\u4ee5\u907f\u514d\u4e3a\u6211\u4eec\u81ea\u5df1\u7684\u7c7b\u5b9e\u73b0hashCode()\u548cequals()\u65b9\u6cd5\u3002<\/li>\n<li>\u7f16\u7a0b\u7684\u65f6\u5019\u63a5\u53e3\u4f18\u4e8e\u5b9e\u73b0\u3002<\/li>\n<li>\u5e95\u5c42\u7684\u96c6\u5408\u5b9e\u9645\u4e0a\u662f\u7a7a\u7684\u60c5\u51b5\u4e0b\uff0c\u8fd4\u56de\u957f\u5ea6\u662f0\u7684\u96c6\u5408\u6216\u8005\u662f\u6570\u7ec4\uff0c\u4e0d\u8981\u8fd4\u56denull\u3002<\/li>\n<\/ul>\n<p>33.Enumeration\u63a5\u53e3\u548cIterator\u63a5\u53e3\u7684\u533a\u522b\u6709\u54ea\u4e9b\uff1f<\/p>\n<p>Enumeration\u901f\u5ea6\u662fIterator\u76842\u500d\uff0c\u540c\u65f6\u5360\u7528\u66f4\u5c11\u7684\u5185\u5b58\u3002\u4f46\u662f\uff0cIterator\u8fdc\u8fdc\u6bd4Enumeration\u5b89\u5168\uff0c\u56e0\u4e3a\u5176\u4ed6\u7ebf\u7a0b\u4e0d\u80fd\u591f\u4fee\u6539\u6b63\u5728\u88abiterator\u904d\u5386\u7684\u96c6\u5408\u91cc\u9762\u7684\u5bf9\u8c61\u3002\u540c\u65f6\uff0cIterator\u5141\u8bb8\u8c03\u7528\u8005\u5220\u9664\u5e95\u5c42\u96c6\u5408\u91cc\u9762\u7684\u5143\u7d20\uff0c\u8fd9\u5bf9Enumeration\u6765\u8bf4\u662f\u4e0d\u53ef\u80fd\u7684\u3002<\/p>\n<p>34.HashSet\u548cTreeSet\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/p>\n<p>HashSet\u662f\u7531\u4e00\u4e2ahash\u8868\u6765\u5b9e\u73b0\u7684\uff0c\u56e0\u6b64\uff0c\u5b83\u7684\u5143\u7d20\u662f\u65e0\u5e8f\u7684\u3002add()\uff0cremove()\uff0ccontains()\u65b9\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662fO(1)\u3002<\/p>\n<p>\u53e6\u4e00\u65b9\u9762\uff0cTreeSet\u662f\u7531\u4e00\u4e2a\u6811\u5f62\u7684\u7ed3\u6784\u6765\u5b9e\u73b0\u7684\uff0c\u5b83\u91cc\u9762\u7684\u5143\u7d20\u662f\u6709\u5e8f\u7684\u3002\u56e0\u6b64\uff0cadd()\uff0cremove()\uff0ccontains()\u65b9\u6cd5\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662fO(logn)\u3002<\/p>\n<p><span id=\"gc\">\u5783\u573e\u6536\u96c6\u5668(Garbage Collectors)<\/span><\/p>\n<p>35.Java\u4e2d\u5783\u573e\u56de\u6536\u6709\u4ec0\u4e48\u76ee\u7684\uff1f\u4ec0\u4e48\u65f6\u5019\u8fdb\u884c\u5783\u573e\u56de\u6536\uff1f<\/p>\n<p>\u5783\u573e\u56de\u6536\u7684\u76ee\u7684\u662f\u8bc6\u522b\u5e76\u4e14\u4e22\u5f03\u5e94\u7528\u4e0d\u518d\u4f7f\u7528\u7684\u5bf9\u8c61\u6765\u91ca\u653e\u548c\u91cd\u7528\u8d44\u6e90\u3002<\/p>\n<p>36.System.gc()\u548cRuntime.gc()\u4f1a\u505a\u4ec0\u4e48\u4e8b\u60c5\uff1f<\/p>\n<p>\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u7528\u6765\u63d0\u793aJVM\u8981\u8fdb\u884c\u5783\u573e\u56de\u6536\u3002\u4f46\u662f\uff0c\u7acb\u5373\u5f00\u59cb\u8fd8\u662f\u5ef6\u8fdf\u8fdb\u884c\u5783\u573e\u56de\u6536\u662f\u53d6\u51b3\u4e8eJVM\u7684\u3002<\/p>\n<p>37.finalize()\u65b9\u6cd5\u4ec0\u4e48\u65f6\u5019\u88ab\u8c03\u7528\uff1f\u6790\u6784\u51fd\u6570(finalization)\u7684\u76ee\u7684\u662f\u4ec0\u4e48\uff1f<\/p>\n<p>\u5728\u91ca\u653e\u5bf9\u8c61\u5360\u7528\u7684\u5185\u5b58\u4e4b\u524d\uff0c\u5783\u573e\u6536\u96c6\u5668\u4f1a\u8c03\u7528\u5bf9\u8c61\u7684finalize()\u65b9\u6cd5\u3002\u4e00\u822c\u5efa\u8bae\u5728\u8be5\u65b9\u6cd5\u4e2d\u91ca\u653e\u5bf9\u8c61\u6301\u6709\u7684\u8d44\u6e90\u3002<\/p>\n<p>38.\u5982\u679c\u5bf9\u8c61\u7684\u5f15\u7528\u88ab\u7f6e\u4e3anull\uff0c\u5783\u573e\u6536\u96c6\u5668\u662f\u5426\u4f1a\u7acb\u5373\u91ca\u653e\u5bf9\u8c61\u5360\u7528\u7684\u5185\u5b58\uff1f<\/p>\n<p>\u4e0d\u4f1a\uff0c\u5728\u4e0b\u4e00\u4e2a\u5783\u573e\u56de\u6536\u5468\u671f\u4e2d\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u5c06\u662f\u53ef\u88ab\u56de\u6536\u7684\u3002<\/p>\n<p>39.Java\u5806\u7684\u7ed3\u6784\u662f\u4ec0\u4e48\u6837\u5b50\u7684\uff1f\u4ec0\u4e48\u662f\u5806\u4e2d\u7684\u6c38\u4e45\u4ee3(Perm Gen space)?<\/p>\n<p>JVM\u7684\u5806\u662f\u8fd0\u884c\u65f6\u6570\u636e\u533a\uff0c\u6240\u6709\u7c7b\u7684\u5b9e\u4f8b\u548c\u6570\u7ec4\u90fd\u662f\u5728\u5806\u4e0a\u5206\u914d\u5185\u5b58\u3002\u5b83\u5728JVM\u542f\u52a8\u7684\u65f6\u5019\u88ab\u521b\u5efa\u3002\u5bf9\u8c61\u6240\u5360\u7684\u5806\u5185\u5b58\u662f\u7531\u81ea\u52a8\u5185\u5b58\u7ba1\u7406\u7cfb\u7edf\u4e5f\u5c31\u662f\u5783\u573e\u6536\u96c6\u5668\u56de\u6536\u3002<\/p>\n<p>\u5806\u5185\u5b58\u662f\u7531\u5b58\u6d3b\u548c\u6b7b\u4ea1\u7684\u5bf9\u8c61\u7ec4\u6210\u7684\u3002\u5b58\u6d3b\u7684\u5bf9\u8c61\u662f\u5e94\u7528\u53ef\u4ee5\u8bbf\u95ee\u7684\uff0c\u4e0d\u4f1a\u88ab\u5783\u573e\u56de\u6536\u3002\u6b7b\u4ea1\u7684\u5bf9\u8c61\u662f\u5e94\u7528\u4e0d\u53ef\u8bbf\u95ee\u5c1a\u4e14\u8fd8\u6ca1\u6709\u88ab\u5783\u573e\u6536\u96c6\u5668\u56de\u6536\u6389\u7684\u5bf9\u8c61\u3002\u4e00\u76f4\u5230\u5783\u573e\u6536\u96c6\u5668\u628a\u8fd9\u4e9b\u5bf9\u8c61\u56de\u6536\u6389\u4e4b\u524d\uff0c\u4ed6\u4eec\u4f1a\u4e00\u76f4\u5360\u636e\u5806\u5185\u5b58\u7a7a\u95f4\u3002<\/p>\n<p>40.\u4e32\u884c(serial)\u6536\u96c6\u5668\u548c\u541e\u5410\u91cf(throughput)\u6536\u96c6\u5668\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/p>\n<p>\u541e\u5410\u91cf\u6536\u96c6\u5668\u4f7f\u7528\u5e76\u884c\u7248\u672c\u7684\u65b0\u751f\u4ee3\u5783\u573e\u6536\u96c6\u5668\uff0c\u5b83\u7528\u4e8e\u4e2d\u7b49\u89c4\u6a21\u548c\u5927\u89c4\u6a21\u6570\u636e\u7684\u5e94\u7528\u7a0b\u5e8f\u3002\u800c\u4e32\u884c\u6536\u96c6\u5668\u5bf9\u5927\u591a\u6570\u7684\u5c0f\u5e94\u7528(\u5728\u73b0\u4ee3\u5904\u7406\u5668\u4e0a\u9700\u8981\u5927\u6982100M\u5de6\u53f3\u7684\u5185\u5b58)\u5c31\u8db3\u591f\u4e86\u3002<\/p>\n<p>41.\u5728Java\u4e2d\uff0c\u5bf9\u8c61\u4ec0\u4e48\u65f6\u5019\u53ef\u4ee5\u88ab\u5783\u573e\u56de\u6536\uff1f<\/p>\n<p>\u5f53\u5bf9\u8c61\u5bf9\u5f53\u524d\u4f7f\u7528\u8fd9\u4e2a\u5bf9\u8c61\u7684\u5e94\u7528\u7a0b\u5e8f\u53d8\u5f97\u4e0d\u53ef\u89e6\u53ca\u7684\u65f6\u5019\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u5c31\u53ef\u4ee5\u88ab\u56de\u6536\u4e86\u3002<\/p>\n<p>42.JVM\u7684\u6c38\u4e45\u4ee3\u4e2d\u4f1a\u53d1\u751f\u5783\u573e\u56de\u6536\u4e48\uff1f<\/p>\n<p>\u5783\u573e\u56de\u6536\u4e0d\u4f1a\u53d1\u751f\u5728\u6c38\u4e45\u4ee3\uff0c\u5982\u679c\u6c38\u4e45\u4ee3\u6ee1\u4e86\u6216\u8005\u662f\u8d85\u8fc7\u4e86\u4e34\u754c\u503c\uff0c\u4f1a\u89e6\u53d1\u5b8c\u5168\u5783\u573e\u56de\u6536(Full GC)\u3002\u5982\u679c\u4f60\u4ed4\u7ec6\u67e5\u770b\u5783\u573e\u6536\u96c6\u5668\u7684\u8f93\u51fa\u4fe1\u606f\uff0c\u5c31\u4f1a\u53d1\u73b0\u6c38\u4e45\u4ee3\u4e5f\u662f\u88ab\u56de\u6536\u7684\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u6b63\u786e\u7684\u6c38\u4e45\u4ee3\u5927\u5c0f\u5bf9\u907f\u514dFull GC\u662f\u975e\u5e38\u91cd\u8981\u7684\u539f\u56e0\u3002\u8bf7\u53c2\u8003\u4e0b<a class=\"external\" href=\"http:\/\/www.javacodegeeks.com\/2013\/02\/java-8-from-permgen-to-metaspace.html\" target=\"_blank\" rel=\"nofollow\">Java8\uff1a\u4ece\u6c38\u4e45\u4ee3\u5230\u5143\u6570\u636e\u533a<\/a><br \/>\n(\u8bd1\u8005\u6ce8\uff1aJava8\u4e2d\u5df2\u7ecf\u79fb\u9664\u4e86\u6c38\u4e45\u4ee3\uff0c\u65b0\u52a0\u4e86\u4e00\u4e2a\u53eb\u505a\u5143\u6570\u636e\u533a\u7684native\u5185\u5b58\u533a)<\/p>\n<p>\u539f\u6587\u94fe\u63a5\uff1a <a class=\"external\" href=\"http:\/\/www.javacodegeeks.com\/2014\/04\/java-interview-questions-and-answers.html\" target=\"_blank\" rel=\"nofollow\">javacodegeeks<\/a> \u7ffb\u8bd1\uff1a <a href=\"http:\/\/www.importnew.com\/\">ImportNew.com <\/a>&#8211; <a href=\"http:\/\/www.importnew.com\/author\/miracle1919\">miracle1919<\/a><br \/>\n\u8bd1\u6587\u94fe\u63a5\uff1a <a href=\"http:\/\/www.importnew.com\/10980.html\">http:\/\/www.importnew.com\/10980.html<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u6211\u4eec\u5c06\u8981\u8ba8\u8bbaJava\u9762\u8bd5\u4e2d\u7684\u5404\u79cd\u4e0d\u540c\u7c7b\u578b\u7684\u9762\u8bd5\u9898\uff0c\u5b83\u4eec\u53ef\u4ee5\u8ba9\u96c7\u4e3b\u6d4b\u8bd5\u5e94\u8058\u8005\u7684Java\u548c\u901a\u7528\u7684\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[46],"tags":[],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/351"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=351"}],"version-history":[{"count":3,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/351\/revisions"}],"predecessor-version":[{"id":358,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/351\/revisions\/358"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=351"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=351"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=351"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}